Donald C. Slack และผู้แต่งคนอื่นๆ. (2017) Subsurface drip irrigation: A technology for safer irrigation of vegetable crops. <i>Engineering and Applied Science Research</i>, <i>44</i>(2), 111-114.Donald C. Slack และผู้แต่งคนอื่นๆ. "Subsurface drip irrigation: A technology for safer irrigation of vegetable crops". Engineering and Applied Science Research 44 (2017):111-114.Donald C. Slack และผู้แต่งคนอื่นๆ. Subsurface drip irrigation: A technology for safer irrigation of vegetable crops. Faculty of Engineering, Khon Kaen University:ม.ป.ท. 2017.